Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Condensed Consolidated Balance Sheets [Abstract]
Accounts receivable, less allowance for doubtful accounts	$ 105	$ 101
Preferred stock, par value	$ 1	$ 1
Preferred stock, shares authorized	25,000,000	25,000,000
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.1	$ 0.1
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	313,792,911	313,792,911
Common stock, shares outstanding	319,615,965	319,615,965